

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */

using System;

using Velocity4Net.Util.Introspection;
using System.Text;
using Velocity4Net.Errors;
using Velocity4Net.Runtime.Logging;
namespace Velocity4Net.Runtime.Parse.AST
{
    /**
     * Executor for looking up property names in the passed in class
     * This will try to find a set&lt;foo&gt;(key, value) method
     *
     * @author <a href="mailto:henning@apache.org">Henning P. Schmiedehausen</a>
     * @version $Id: SetPropertyExecutor.java 687177 2008-08-19 22:00:32Z nbubna $
     * @since 1.5
     */
    public class SetPropertyExecutor
            : SetExecutor
    {
        private Introspector introspector;

        /**
         * @param log
         * @param introspector
         * @param clazz
         * @param property
         * @param arg
         */
        public SetPropertyExecutor(Log log, Introspector introspector,
                 Type clazz, String property, Object arg)
        {
            this.log = log;
            this.introspector = introspector;

            // Don't allow passing in the empty string or null because
            // it will either fail with a StringIndexOutOfBounds error
            // or the introspector will get confused.
            if (!String.IsNullOrEmpty(property))
            {
                discover(clazz, property, arg);
            }
        }

        /**
         * @return The current introspector.
         */
        protected Introspector getIntrospector()
        {
            return this.introspector;
        }

        /**
         * @param clazz
         * @param property
         * @param arg
         */
        protected void discover(Type clazz, String property, Object arg)
        {
            Object[] _params = new Object[] { arg };

            try
            {
                StringBuilder sb = new StringBuilder("set_");
                sb.Append(property);

                Method = (introspector.getMethod(clazz, sb.ToString(), _params));

                if (!isAlive())
                {
                    /*
                     *  now the convenience, flip the 1st character
                     */



                    Method=(introspector.getMethod(clazz, sb.ToString(), _params));
                }
            }
            /**
             * pass through application level runtime exceptions
             */
            catch (ApplicationException e)
            {
                throw e;
            }
            catch (System.Exception e)
            {
                String msg = "Exception while looking for property setter for '" + property;
                log.error(msg, e);
                throw new VelocityException(msg, e);
            }
        }

        /**
         * Execute method against context.
         * @param o
         * @param value
         * @return The value of the invocation.
         * @throws IllegalAccessException
         * @throws InvocationTargetException
         */
        public override Object Execute(Object o, Object value)
        {
            Object[] _params = new Object[] { value };
            return isAlive() ? Method.Invoke(o, _params) : null;
        }
    }
}